#ifndef _CIRCULAR_BUFFER_H_
#define _CIRCULAR_BUFFER_H_

#include <qwt_series_data.h>
#include <qvector.h>

class CircularBuffer: public QwtSeriesData<QPointF>
{
public:
    CircularBuffer(double interval = 10.0, size_t numPoints = 1000);
    void fill(double interval, size_t numPoints);

    void setReferenceTime(double);
    double referenceTime() const;

    virtual size_t size() const;
    virtual QPointF sample(size_t i) const;

    virtual QRectF boundingRect() const;

    void setFunction(double(*y)(double));

private:
    double (*d_y)(double);

    double d_referenceTime;
    double d_interval;
    QVector<double> d_values;

    double d_step;
    int d_startIndex;
    double d_offset;
};

#endif
